It's been revised a few times by now, but the Richard Gross book, 'Psychology: The Science of Mind and Behaviour' is a classic introduction
and is easy to read. You could probably pick it up 2nd hand for very little cash.

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Any of Jung's work, especially the stuff about the anima/animus and the collective unconscious.
Stanislav Grof's work in transpersonal psychology,
and Timothy Leary's neuro-psychology, consiousness circuit writings

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